fix: export error type

Author: krizzu

packages/async-storage/src/index.tsx

@@ -3,5 +3,7 @@ import { getLegacyStorage } from "./createAsyncStorage";
 export type { AsyncStorage } from "./AsyncStorage";
 export { createAsyncStorage } from "./createAsyncStorage";
 
+export { AsyncStorageError } from "./AsyncStorageError";
+
 // Legacy storage that is proxy to an old storage data.
 export default getLegacyStorage();